| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for improving the sensitivity of a temperature sensor in a temperature control circuit for a high stability crystal oscillator to thereby highly accurately set the storage temperature of a crystal vibrator. SOLUTION: The temperature control circuit for the highly stable crystal oscillator comprising thermisters; a differential operational amplifier; a constant-voltage element;a power transistor;and a heater, controls a heater circuit, by applying a voltage resulting from dividing a constant voltage produced by the constant-voltage element by a resistor and the first thermister to a noninverting input of the differential operational amplifier and applying a voltage resulting from dividing the constant voltage by the second thermister and a variable resistor to an inverting input of the differential operational amplifier. COPYRIGHT: (C)2005,JPO&NCIPI
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